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SPSS® 12.0 Command Syntax Reference

SPSS® 12.0 Command Syntax Reference

SPSS® 12.0 Command Syntax Reference

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1518 SPCHART<br />

• A duplicated subcommand name causes a syntax error.<br />

• A duplicated keyword is silently ignored.<br />

• There is no default keyword or parameter value.<br />

The Process Capability Indices<br />

CP Capability of the process.<br />

CPU The distance between the process mean and the upper specification limit<br />

scaled by capability sigma.<br />

CPL The distance between the process mean and the lower specification limit<br />

scaled by capability sigma.<br />

K The deviation of the process mean from the midpoint of the specification limits.<br />

This is computed independently of the estimated capability sigma.<br />

CPK Capability of process related to both dispersion and centeredness. It is the<br />

minimum of CpU and CpL. If only one specification limit is provided, we<br />

compute and report a unilateral CpK instead of taking the minimum.<br />

CR The reciprocal of CP.<br />

CPM An index relating capability sigma and the difference between the process<br />

mean and the target value. A target value must be specified on the TARGET<br />

subcommand by the user.<br />

CZU The number of capability sigmas between the process mean and the upper<br />

specification limit.<br />

CZL The number of capability sigmas between the process mean and the lower<br />

specification limit.<br />

CZMIN The minimum number of capability sigmas between the process mean and<br />

the specification limits.<br />

CZMAX The maximum number of capability sigmas between the process mean and<br />

the specification limits.<br />

CZOUT The estimated percentage outside the specification limits. The standard normal<br />

approximation is based on the CZ U and CZ L .<br />

• For each of the keywords other than CPK, both of the LSL subcommand and the USL<br />

subcommands must be specified. Otherwise, the keyword(s) are ignored and issue a<br />

syntax warning. For CPK, at least one of the LSL and USL subcommands must be specified.<br />

• The keyword CPM is ignored with a syntax warning if the TARGET subcommand is not<br />

specified.

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